NEWS.md in nanoc-4.12.20 vs NEWS.md in nanoc-4.12.21

@@ -1,6 +1,17 @@
 # Nanoc news
 
+## 4.12.21 (2024-04-27)
+
+Fixes:
+
+- Fixed a rare “private method printf” error (#1694)
+
+Enhancements:
+
+- Sped up checksummer and made it more reliable and correct (#1693)
+- Removed Nokogiri warning message on JRuby (#1700)
+
 ## 4.12.20 (2024-03-15)
 
 Enhancements:
 
 - Add base64 as a gem dependency (#1681)